HomeCompare fishForktail rainbowfish vs Crescent betta Forktail rainbowfish vs Crescent betta: can they live together? Verdict: CompatibleBoth are comfortable at 24–26°C (75–79°F).A pH of 6.0–7.0 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideForktail rainbowfishCrescent bettaAdult size5 cm (2 in)6 cm (2.4 in)Minimum tank75 L (20 US gal)40 L (11 US gal)Temperature24–26°C (75–79°F)24–30°C (75–86°F)pH6.0–8.06.0–7.0Hardness5–12 dGH (89–214 ppm)5–19 dGH (89–339 ppm)TemperamentPeacefulPeacefulCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesForktail rainbowfishPseudomugil furcatusCrescent bettaBetta imbellis